This is mostly because you have either VirtualBox or VMware running on the same machine. The reason (at least that’s what I think) is that the kernel module of VirtualBox or VMware and KVM can’t take Advantage of Intel VT-x or AMD-V at the same time.

So if you want to run both at the same time you have to deactivate the virtualisation in one of them.

This is a way where you can at least have the machines emulated with QEMU

This is a simple script you can copy and paste to your console to install puppet on a new host. You just need to edit the first two lines with the server information and then sign the requested certificate on the puppet master.